You can get the latest Version of the Plugin for Moodle from the downloads .

You can find the OpenMeetings Plugin also in the Moodle Plugin database .

A demo version of the Moodle plugin is available at moodle.openmeetings.de .

You simply download the ZIP package and unzip it to Moodle's mod directory.
The you visit the admin interface of Moodle, for example http://$your_moodle_host/$MOODLE_WWW_ROOT/admin

In Moodle's module configuration web-interface you will find the Plugin's configuration